Functions
2.4 Backup Overcurrent
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
91
Time Delays
The time delays are set specifically for each element:
50-B2 DELAY, 67-B2 DELAY addess 2624
50N-B2 DELAY, 67N-B2 DELAY addess 2627
50-B1 DELAY, 67-B1 DELAY addess 2614
50N-B1 DELAY, 67N-B1 DELAY addess 2617
51-B TD IEC, 67-TOC TD IEC addess 2634 (IEC characteristic)
51N-B TD IEC, 67N-TOC TD IEC addess 2639 (IEC characteristic)
51-B TD ANSI, 67-TOC TD ANSI addess 2635 (ANSI characteristic)
51N-B TD ANSI, 67N-TOC TD ANSI addess 2640 (ANSI characteristic)
They are determined by the time grading chart created for the power system. If used as emergency overcurrent
protection, shorter tripping times are advisable as this function is only activated in the case of the loss of the
local measuring voltage.
The times for the ground current elements can be set shorter, according to a separate time grading chart for
ground currents.
You can set additional time delays for definite-time elements with IEC characteristic.
51-B AddT-DELAY, 67-TOC AddTDel. addess 2636
51N-B AddTdelay, 67N-TOC AddTDel addess 2641
Instantaneous Tripping via Binary Input
Binary input „>5X-B InstTRIP“ allows you to bypass the time delays. The binary input applies to all ele-
ments collectively.
You can specify for each element whether instantaneous tripping takes effect. The setting applies collectively
to the corresponding phase and ground element.
50-1, 3I0> address 2628
50-2, 3I0>> address 2618
50N, 3I0p address 2644
The following settings are possible:
• If set to YES, the element trips instantaneously when the binary input is activated.
• When set to NO, the set time delays take effect.
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